×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Problems with contact elements in CATIA V5 analysis

Problems with contact elements in CATIA V5 analysis

Problems with contact elements in CATIA V5 analysis

(OP)
Good day everyone,

I am presently trying to learn myself to use the FEM package that comes with V5(R14 sp6e).  To make things simple I decided to model 2 plates fastened with two rivets...seemed easy enough at the time!!  I modelled the two plates clamped one the plates and loaded the other.  I modelled the rivets as a solid and used contact elements with the faces of the holes in the plates and restrained the vertical translation in the top and bottom of my rivets (because on my first run the rivet jumped 39 in. out of the holes!!).  My problem now, is that I always get the "singularity detected" message after computation, and the deformed plot shows that the only deformation in my model is one of the rivets growing radially from its original size to practically the size of the whole assembly.  Since I'm using contact element, should'nt the radial growth from the rivets not even be happening at all??  I also tried using the user-defined contraints to model the rivets (in lieu of modelling as a solid) but I could not find a way to block the vertical translation and this also resulted in the constraint ending up 39 in. vertically out of the holes after computation (and with the "singularity" error)

I hope I made myself clear (this is my first post here!!)

Thanks for your help.

Simon

RE: Problems with contact elements in CATIA V5 analysis

Make sure you have connections defined between rivet-plate and plate-plate.

RE: Problems with contact elements in CATIA V5 analysis

(OP)
I defined every possible connection (using analysis connections and then applying contact, slider and restraints to them) I can think of between the rivet and the plate...

If I don't correctly restrain the pin vertically it moves freely and creates a singularity...as soon as I restrain it vertically it creates the problem I had point above (pin grows radially outwards by 226 in!!)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources